Overview
LCD4500/LCD4501/LCD5500Z programmable-message keypads are operator interfaces for MAXSYS PC4010/PC4020 systems. They support full status, arming, programming entry, and trouble scroll on Combus.
Panel bus / link type
Combus (MAXSYS)
At a Glance
| Detail | Value |
|---|---|
| Product type | Alarm keypad / operator interface |
| Model family (LCD4500, LCD4501, LCD4501T, LCD5500Z) | See label and install manual |
| Bus / wireless link | Combus (MAXSYS) |
| Primary manual | LCD4501(T) Installation Manual; MAXSYS PC4020 Install Manual keypad section |
| Region / listing notes | T suffix models for telco/listed variants — match manual to label |
Before You Install or Replace One
- Confirm exact model number on the keypad label matches the install manual.
- Verify host panel family — Keybus PowerSeries, Neo Corbus, MAXSYS Combus, and IMPASSA wireless are not interchangeable.
- Plan unique keypad address or wireless enrollment — duplicates cause bus collisions or offline devices.
- Check partition assignment (global vs partition keypad) for multi-partition sites.
- Include keypad current draw in panel AUX / Corbus / battery standby calculations.
Official Sources
- Product page: DSC LCD5500Z (ID 965)
- LCD4501(T) Installation Manual; MAXSYS PC4020 Install Manual keypad section — DSC official documentation
FAQs
Which panels does this keypad work with?
See compatible-peripherals.md for the host panel table. Keypads are family-specific — PK5500 does not work on Neo Corbus, and WT5500 is IMPASSA-only.
Why is the keypad blank but the panel has power?
Usually bus wiring, wrong address, or AUX/Corbus undervoltage. Wireless keypads: check battery and enrollment.
Can I use this keypad for programming?
Full-message and touchscreen models typically support **[*, 8, installer code]** where the host panel allows. Fixed LED keypads have limited programming menus.
Can I move this keypad to another panel brand?
Only within the same DSC bus family after full re-address and reprogramming. Never move Keybus keypads to Neo Corbus without replacing the keypad model.
Where is the official documentation?
DSC LCD5500Z (ID 965) — LCD4501(T) Installation Manual; MAXSYS PC4020 Install Manual keypad section